Liquid crystal composition and liquid crystal display device

Abstract

A subject is to provide a liquid crystal composition that has a negative dielectric anisotropy and contains a specific 3-ring compound having a large optical anisotropy as a first component and a compound having a large negative dielectric anisotropy and containing a methyleneoxy group or pyran ring as a second component, and may contain a specific compound having a small viscosity as a third component and a specific compound having a large negative dielectric anisotropy as a fourth component, respectively, and a liquid crystal display device that contains the composition.

1 . A liquid crystal composition that has a negative dielectric anisotropy and contains at least one compound selected from the group of compounds represented by formula (1) as a first component and at least one compound selected from the group of compounds represented by formula (2) as a second component, and a ratio of the first component is in the range of 5% by weight to 95% by weight based on the total weight of the liquid crystal composition: 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2 , R 3  and R 4  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyloxy having 2 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A is independently 
       
         
           
           
               
               
           
         
       
       X 1 , X 2  and X 3  are independently hydrogen, fluorine or chlorine; Z 1  is independently a single bond, ethylene, methyleneoxy or carbonyloxy; m is 1, 2 or 3; when X 1  is hydrogen in formula (1), X 2  and X 3  are fluorine or chlorine; and at least one of Z 1  is methyleneoxy, or at least one of ring A is 
       
         
           
           
               
               
           
         
       
       in formula (2). 
     
     
         2 . The liquid crystal composition according to  claim 1 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1) and formula (1-2): 
       
         
           
           
               
               
           
         
       
       wherein R 1  and R 2  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyloxy having 2 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine. 
     
     
         3 . The liquid crystal composition according to  claim 2 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1). 
     
     
         4 . The liquid crystal composition according to  claim 1 , wherein the second component is at least one compound selected from the group of compounds represented by formula (2-1) to formula (2-10): 
       
         
           
           
               
               
           
         
       
       wherein R 3  and R 4  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyloxy having 2 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine. 
     
     
         5 - 6 . (canceled) 
     
     
         7 . The liquid crystal composition according to  claim 1 , wherein a ratio of the first component is in the range of 10% by weight to 60% by weight, and a ratio of the second component is in the range of 10% by weight to 90% by weight based on the total weight of the liquid crystal composition. 
     
     
         8 . The liquid crystal composition according to  claim 1 , further containing at least one compound selected from the group of compounds represented by formula (3) as a third component: 
       
         
           
           
               
               
           
         
       
       wherein R 5  and R 6  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring B, ring C and ring D are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene; Z 2  and Z 3  are independently a single bond, ethylene, methyleneoxy or carbonyloxy; p is 0, 1 or 2; when p is 1, ring B, ring C and ring D are independently 1,4-cyclohexylene or 1,4-phenylene. 
     
     
         9 . The liquid crystal composition according to  claim 8 , wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to formula (3-11): 
       
         
           
           
               
               
           
         
       
       wherein R 5  and R 6  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine. 
     
     
         10 - 14 . (canceled) 
     
     
         15 . The liquid crystal composition according to  claim 8 , wherein a ratio of the third component is in the range of 5% by weight to 60% by weight based on the total weight of the liquid crystal composition. 
     
     
         16 . The liquid crystal composition according to  claim 1 , further containing at least one compound selected from the group of compounds represented by formula (4-1) and formula (4-2) as a fourth component: 
       
         
           
           
               
               
           
         
       
       wherein R 7  and R 8  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring E, ring F and ring G are independently 1,4-cyclohexylene or 1,4-phenylene; Z 4  is a single bond, ethylene or carbonyloxy; Z 5  and Z 6  are independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 4  and X 5  are fluorine or chlorine; Y 1  is hydrogen or methyl; q is 1, 2 or 3; r and s are independently 0, 1, 2 or 3, and a sum of r and s is 3 or less. 
     
     
         17 . The liquid crystal composition according to  claim 16 , wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1-1) to formula (4-1-9), and formula (4-2-1) to formula (4-2-5): 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       wherein R 7  and R 8  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine. 
     
     
         18 - 21 . (canceled) 
     
     
         22 . The liquid crystal composition according  claim 16 , wherein a ratio of the fourth component is in the range of 5% by weight to 50% by weight based on the total weight of the liquid crystal composition. 
     
     
         23 . The liquid crystal composition according to  claim 1 , wherein a maximum temperature of a nematic phase is 70° C. or higher, an optical anisotropy (25° C.) at a wavelength of 589 nanometers is 0.08 or more and a dielectric anisotropy (25° C.) at a frequency of 1 kHz is −2 or less. 
     
     
         24 . A liquid crystal display device, containing the liquid crystal composition according to  claim 1 . 
     
     
         25 . The liquid crystal display device according to  claim 24 , wherein an operating mode in the liquid crystal display device is a VA mode, an IPS mode or a PSA mode, and a driving mode in the liquid crystal display device is an active matrix mode. 
     
     
         26 . The liquid crystal composition according to  claim 8 , further containing at least one compound selected from the group of compounds represented by formula (4-1) and formula (4-2) as a fourth component: 
       
         
           
           
               
               
           
         
       
       wherein R 7  and R 8  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring E, ring F and ring G are independently 1,4-cyclohexylene or 1,4-phenylene; Z 4  is a single bond, ethylene or carbonyloxy; Z 5  and Z 6  are independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 4  and X 5  are fluorine or chlorine; Y 1  is hydrogen or methyl; q is 1, 2 or 3; r and s are independently 0, 1, 2 or 3, and a sum of r and s is 3 or less. 
     
     
         27 . The liquid crystal composition according to  claim 26 , wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1-1) to formula (4-1-9), and formula (4-2-1) to formula (4-2-5): 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       wherein R 7  and R 8  are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine.